Tektronix 7834

Operating
Instructions--7834
52 . Turn the
PERSISTENCE, STORAGE LEVEL, and A
INTENSITY
controls fully counterclockwise and set the
time-base unit for auto triggering at a sweep rate of 0 .5
second/division .
53 . Set the PERSISTENCE control to
midrange and slowly
increase the A INTENSITY
(clockwise) until the trace
appears . Vary the PERSISTENCE
control setting and
notice that the trace can be made to
build up or to fade
more quickly, depending on
the control setting . Varying
the
A INTENSITY control also affects the display in the
same
manner . Return the PERSISTENCE
control to
midrange and slowly decrease the A
INTENSITY control to
the point where the trace is just extinguished
; then set the
STORAGE
LEVEL control fully clockwise and notice that
the trace becomes
visible again .
54 . Turn the PERSISTENCE,
STORAGE LEVEL, and
A INTENSITY controls
fully counterclockwise and set the
time-base unit for auto
triggering
at
a sweep rate of 0 .5
millisecond/division
.
55 . Press the FAST
BISTABLE push button .
56 . Press
the ERASE push button and notice that the
screen background appears
to alternate between bright and
dim . This indicates that the sweep
and transfer functions
are operating .
57 . Set the MULTI TRACE DLY
control fully clockwise ;
then, slowly increase the
A INTENSITY control (clockwise)
until
the display stores . Notice that each sweep is stored
without erasing the previously stored sweep . This is
easily
observed if the vertical position control is
varied between
sweeps .
58 . Press the ERASE push button and notice that the
display is erased .
59 . Set the time-base unit for single
sweep and press the
ERASE push button . Notice that only
one sweep is stored
(trigger time-base unit if necessary) .
60 . Change the setting of the vertical position
control and
initiate another sweep by pressing the
reset button on the
time-base unit . Notice that the new sweep
is stored along
with the one stored in the
previous step .
61
. Alternately press the ERASE push button
and reduce
the A INTENSITY control to the point
where the display
just fails to store .
62
. Alternately increase the STORAGE LEVEL
(clockwise)
and press the ERASE push button
. Notice that as the
STORAGE LEVEL is
increased, the display begins to store .
63 .
The FAST VAR PERSIST mode operates exactly as
outlined for the VAR PERSIST mode
except that the
sweep and transfer functions are
operative as described for
FAST BISTABLE
operation .
64 . Set the
time-base unit for auto triggering and set the
7834 for
BISTABLE operation .
65 . Set
the
A
INTENSITY control to its 1 o'clock
position . Turn
the ERASE control out of the detent
position and
notice that erase cycles occur automatically
and with increasing frequency as the control is turned
clockwise .
66 .
Return the ERASE control to the detent
(OFF)
position and set the time-base unit for single
sweep and
external triggering . Turn the SAVE INTENSITY control
fully counterclockwise
.
67
. Press the ERASE push button ; notice that no
sweep
occurs .
68 . Press
the SAVE push button ; notice that no sweep
occurs (this is
the "Auto Save" mode) . Since no trigger was
available,
the sweep did not run ; therefore, the system waits
in a ready-to-store mode .
69 .
Set the time-base unit to internal trigger and notice
that the screen goes dark . This indicates that a
sweep has
occurred and that the system has
entered the SAVE mode .
70 . Turn the SAVE INTENSITY control
clockwise and
notice that the stored display becomes
visible .
71 . Press the NON-STORE
push button and set the time-
base unit for auto
triggering .